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Avoid misuse of StepAttacksBB for pawns

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Make it explicit that first index of StepAttacksBB is a piece, not a piece type.

No functional change

Closes #1083
This commit is contained in:
snicolet 2017-04-25 17:57:30 -07:00 • committed by Joona Kiiski
parent d06a8d0c18
commit 49a9d4cf99
2 changed files with 3 additions and 2 deletions
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4
src/bitbase.cpp
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@ -117,7 +117,7 @@ namespace {
if ( distance(ksq[WHITE], ksq[BLACK]) <= 1
|| ksq[WHITE] == psq
|| ksq[BLACK] == psq
|| (us == WHITE && (StepAttacksBB[PAWN][psq] & ksq[BLACK])))
|| (us == WHITE && (StepAttacksBB[W_PAWN][psq] & ksq[BLACK])))
result = INVALID;
// Immediate win if a pawn can be promoted without getting captured
@ -130,7 +130,7 @@ namespace {
// Immediate draw if it is a stalemate or a king captures undefended pawn
else if ( us == BLACK
&& ( !(StepAttacksBB[KING][ksq[us]] & ~(StepAttacksBB[KING][ksq[~us]] | StepAttacksBB[PAWN][psq]))
&& ( !(StepAttacksBB[KING][ksq[us]] & ~(StepAttacksBB[KING][ksq[~us]] | StepAttacksBB[W_PAWN][psq]))
|| (StepAttacksBB[KING][ksq[us]] & psq & ~StepAttacksBB[KING][ksq[~us]])))
result = DRAW;

1
src/position.h
View file

@ -273,6 +273,7 @@ inline Square Position::castling_rook_square(CastlingRight cr) const {
template<PieceType Pt>
inline Bitboard Position::attacks_from(Square s) const {
assert(Pt != PAWN);
return Pt == BISHOP || Pt == ROOK ? attacks_bb<Pt>(s, byTypeBB[ALL_PIECES])
: Pt == QUEEN ? attacks_from<ROOK>(s) | attacks_from<BISHOP>(s)
: StepAttacksBB[Pt][s];